BOYNEXTDOOR have some tips on how to be a "Nice Guy" in their latest comeback concept film, revealed on August 22 KST. 

In the 'Nice' version concept film, the members of BOYNEXTDOOR show how hard work and good-natured fun go hand in hand, no matter what you're doing. 

The rookie group's upcoming 3rd mini album '19.99' features a total of 7 tracks, including the title track, "Nice Guy". A pre-release single, "Dangerous", will be out on September 2, while the mini album itself will drop on September 9 at 6 PM KST. 

SEE ALSO: BOYNEXTDOOR wrap up first-week sales for '19.99' with over 750,000 copies sold